Captain Sisay, Mind Over Matter, and Progenitus

Prerequisites

• Captain Sisay on the battlefield
• Mind Over Matter on the battlefield
• Progenitus in the library

Steps

1. Activate Captain Sisay by tapping it, searching your library for Progenitus and putting it into your hand
2. Activate Mind Over Matter by discarding Progenitus
3. Progenitus triggers, shuffling your graveyard into your library
4. Resolve the Mind Over Matter ability, untapping Captain Sisay
5. Repeat

Results

• Infinite self-discard triggers